Respiration

5. organelle that carries out respiration
8. increases during inhalation
9. tiny projections that act as a mechanical barrier
10. an organ surrounded by a network of blood capillaries
12. relaxes during exhalation
14. contracts during inhalation
16. the part of the respiratory system where the gases are branched into the two lungs
17. produced as a result of breaking down nutrient molecules without the use of oxygen

1. diffusion of two specific substances into and out of the body
2. the movement of air into and out of the lungs by breathing movements
3. a specialised cell that is involved in a substance that acts as a chemical barrier
4. where respiration without oxygen occurs
6. chemical reaction that releases energy
7. releasing energy from glucose without using oxygen
11. an adaptation of air sacs
13. debt a required substance after anaerobic respiration has taken place
15. increases during inhalation and decreases during exhalation